Composite indices and skip scanning
- From: "Boyle, Christopher J." <Christopher.J.Boyle@xxxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Thu, 15 Apr 2004 09:11:00 -0400
Oracle 9.2.0.2.0=20
I have an intersection table composed of PK_TABLE_A, PK_TABLE_B which is
being used to handle a M:M relationship between A and B. There is a
unique constraint on the combination of the two entries and a
corresponding index with A as the leading value. When I was trying to
access table A using the PK from table B I expected it to use that index
because of the 9i skip scan feature that allows for a non leading index
member to still utilize the index. What I got was a FTS until I added a
separate index on PK_TABLE_B only. Is there something with a unique
index that prevents skip scanning? Or do I have too much blood in my
caffeine and am mis-rembering how the indices should work?
Thanks,
Chris =20
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